Method of manufacturing grinding



G. E. vANE 2,157,779 NG GRINDING Wl-ITJELS Of ABRASIVE MATRTAL May l9,1939.

METHOD OF MANUFACTUR Filed Jan. '28, 1936 INVENTOR CLM'CL ATTORNEYPatented May 9, 1939 A vUNITED STATES PATENT ori-#Ice MTHOD FlldANUFAC'lU'R/ING` GRINDING WHEELS 0F ABRASIVE MATERIAL George E.Vance, Springfield, Ohio, assigner to T-h Safety Grinding'Wheel &Machine Company, Springfield, Ohio, a corporation of Ohio ApplicationJanuary 2s. 1936, serial No. 612,212

2 claims. (ci. 51-278) 'This invention relates to a method of makingmove abrasive material from the heavy portion grinding wheels ofabrasive material. and place it on the light portion until the mold Inthe manufacture of grinding wheels'the is in perfect balance. The nextstep is to remove abrasive material is pressed into a mold and then themold from the turn-table -and compress the 5 baked. It often happens,however, that by this green material in the mold, and the next step 5process of manufacturing the wheels generally is to then bake thematerial which can be accomare out of balance andit has been customaryto plished by either baking it in the mold or prefbalance the wheelsafter being baked by chipping erably removing it from the mold.

awayportions of the heavy side of the wheel, As a result of this methodthe wheel after which is unsatisfactory, as it is very diillcult tobeing baked is in perfect balance'and obviates 10 balance the wheels inthis fashion and itis essenany necessity of chipping away portions ofthe tial that the wheels should be in as perfect balbaked wheel forbalancing purposes. ance as possible'. If desired, any suitable scaleindicating mech- The 4object o'f this invention is to provide a anismmay be used in connection with the appal5 method whereby the wheel isbalanced before it ratus employed for carrying out themethod, 15 isbaked after the green abrasive material has which mechanism will beoperated by the turnbeen placed in the mold and before being coxntable'in any suitable way, when the table is pressed in the mold. rotated. Ifindicating mechanism is not desir- In the accompanying drawing: able,the turn-table may be omitted and the Fig. 1- is a top plan view of anapparatus for mold tiltably mounted upon a spindle carried by 20carrying out the method.- the base.

Fig. 2 is a section on the line 2-2 of Fig. 1. While the apparatus usedin connection with Fig. 3 is a side elevation of the apparatus.4carrying out this method has been described as Fig. 4 is a detail of aportion of the base and a including 'a turn-table upon which the mold isportion of the mold supporting frame, showing mounted so that the moldmay be turned to dif- 25 one of the knife edge bearings. ferentpositions in order -t'o better determine the Referring to the drawing, Irepresents a suitheavy and light sides, this turn-table is not abablesupporting base and 2 is a frame which is solutely necessary. but themold may be mounted tiltably mounted upon standardsA 3 projecting upon astationary spindle upon whichit can be upwardly from the frame .by twovoppositely arrotated to determine the' heavy and light sides. 30 'rangedknife-edged bearings l. :A yturn-table 5 Further, the particular form ofbalancing device is rotatably mounted upon the frame 2 throughdescrlbed'isnot'absolutely essential but any well the medium of ballbearings 6, the lower race 1 known form of horizontal balancing may beofl which is carried" by cross-members 8 secured employed. Y to theframe 2. The turn-table has a centrally Having thus described myinvention, I claim: 35 arranged spindle 9 upon which is rotatably 1. Themethod of manufacturing a grinding mounted the mold lli which receivesthe abrasive wheel oi abrasive material consisting in placing materialrepresented at Il. By reason of the` the green abrasive material in abalanced tilt- 2 fact that t he supporting frame is mounted upon ablemold, rotating the mold to determine the 40, the base by the oppositelyarranged knife-edged heavy and light sides thereof if any exist, then 40bearings it will be seen that the mold will be removing abrasivematerial from the heavy portiltably mounted upon the base. In operationtion of the mold to a lighter portion to balance the frame is nrstbalanced upon the` supportthe mold and material, then pressing themateing base by any suitable means such as applying rial in the mold,and thereafter baking the weights of any suitable character to the lightmaterial. l l

side thereof which would bring the turn-table 2. In an apparatus formanufacturing a grindinto balance and the mold is then balanced in ingwheel, a base, a pair of oppositely arranged position byllkewiseapplying weights of any suitstandards on said base, a supporting frameable character to the light side thereof. The mold mounted onsaidstandards by knife-edge bearis then nlled with green abrasivematerial and ings, and a mold supporting turn-table rotatably 50 afterthe material has been placed in the mold. mounted upon said supportingframe. if the mold tilts due to the fact that one portion Y is heavierthan the athen-the next step is to re-.- GEORGE E. VANCE.'

